VintageKustom.com: Repairing Kustom Amps

Fri, 17 August 2018 01:02

Lovguitar
Messages: 15
Registered: August 2018

Junior Member

I have become somewhat obsessed with Kustom Amps and picked up a "supposedly" properly working amp on ebay. Turns out that the volume is fine, noise floor is fine, trem works really well but reverb is broken. When you turn up the reverb control all you get is loud hum. If you bang the tank you hear it through the amp pretty loudly, so we know that the return side works. Previous owner replaced the tank with a much smaller tank which may or may not be proper. When I substituted in a good known tank it hummed just like the replacement. I should have sent it back but now I'm hooked on wanting to fix them!!!!!!

The pc104 board does not have female rca jacks mounted on it for the reverb. It has coaxial wire with one side directly soldered to the board and the other side terminating in a male rca jack. The "send" jack is hooked up oddly and it makes no sense to me. The "hot" wire is soldered to the board and the shield contacts the hot wire, so both the hot side of the male plug and the "shield" side of the plug are connected together.

I've looked carefully at the schematic and can't make hide nor hair of the reverb. There's a rectangle marked reverb with arrows pointed away from the tank on both sides.

I'd appreciate some help with this please. I'd love to get this working right -- for the principle of the thing and to have a spare working k100-2.

Thanks in advance!!

Paul

Report message to a moderator